There and Back Again has exactly two lore counters on it.
Umbral Mantle attached to
Satsuki.
Satsuki does not have summoning sickness.
Mana Needed
({1} magic symbol) ({BP} magic symbol) , plus an additional ({5} magic symbol) ({BP} magic symbol) available if you do not control a Smaug token available.
Steps
Activate
Satsuki by tapping it, putting a lore counter on
There and Back Again.
There and Back Again's third chapter ability triggers.
Holding priority, activate
Hex Parasite by paying ({1} magic symbol) ({BP} magic symbol) , removing a lore counter from
There and Back Again and giving
Hex Parasite +1/+0 until end of turn.
Resolve the
There and Back Again ability, creating a legendary 6/6 Smaug creature token.
If you control two Smaugs, put one into your graveyard due to the legend rule.
If you do, the Smaug that died triggers, creating fourteen Treasure tokens.
If you made Treasures this way, activate six Treasures by tapping and sacrificing them, adding ({5} magic symbol) ({B} magic symbol) .
Activate
Staff of Domination's third ability by paying ({3} magic symbol) and tapping it, untapping
Satsuki.
Activate
Staff of Domination's first ability by paying ({1} magic symbol) , untapping it.
Repeat.
Once you have infinite mana, you may use it to activate